PHOTOS: So So Def 20th Anniversary Concert

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Jermaine Dupri got a lot of help from his friends at the So So Def 20th Anniversary concert in Atlanta on Saturday night. In addition to his performance from So So Def artists like Da Brat and Kris Kross, his pals Jay-Z, Usher, Mariah Carey, Ludacris, Nelly, Young Jeezy, Monica and more showed up for the party. Check out photos from the special So So Def 20th Anniversary concert in the gallery that follows.